Physics HELP!
posted by Maggie .
I have NO idea how to do this! any help is great!
A car of maass 1330kg is traveling at 28m/s. The driverapplies the brakes to bring the car to a rest over a distance of 79m. Calculate the retarding force acting on the car.
From this i can see that it gives me the
Mass:1330kg
the inicial velocity: 28m/s
and the distance: 79m
i'm trying to find the force, but i can't think of a formula using the known variables!!

F = ma. We know m, now we need to find "a".
V^2 = Vo^2 + 2a*d
a = (V^2Vo^2)/2d.
a = (0784)/158 = 4.96 m/s^2.
F = 1330*(4.96) = 6600 N.